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Related Concept Videos

Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
Vitamins01:30

Vitamins

Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
Lipids: Dietary Sources and Requirements01:18

Lipids: Dietary Sources and Requirements

Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ meats, shellfish,...

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Related Experiment Video

Updated: Jun 24, 2026

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
09:50

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Published on: August 14, 2019

Dietary flavonoids as antioxidants.

Junji Terao

    Forum of Nutrition
    |April 16, 2009
    PubMed
    Summary

    Dietary flavonoids, rich in fruits and vegetables, combat atherosclerosis through antioxidant activity. Specific metabolites like quercetin 3-O-beta-d-glucuronide (Q3GA) show potent effects in nerve cells and inhibit cholesterol deposition in arteries.

    Area of Science:

    • Biochemistry
    • Nutritional Science
    • Cardiovascular Research

    Background:

    • Flavonoids, abundant in plant-based foods, are recognized for their potential in preventing degenerative diseases like atherosclerosis.
    • Their antioxidant properties, particularly free radical scavenging, are key to this protective effect.
    • The catechol group (o-dihydroxyl) on the B ring of flavonoids is crucial for their potent antioxidant activity.

    Purpose of the Study:

    • To investigate the antioxidant mechanisms of flavonoids, focusing on their role in preventing atherosclerosis.
    • To evaluate the antioxidant activity of specific flavonoid metabolites, such as quercetin 3-O-beta-d-glucuronide (Q3GA), in cellular and animal models.
    • To determine the distribution and effects of quercetin metabolites in human atherosclerotic lesions.

    Main Methods:

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    • Analysis of flavonoid antioxidant mechanisms, including free radical scavenging and inhibition of oxidative enzymes.
    • In vitro studies using the PC-12 nerve cell model to assess Q3GA's effect on oxidative stress.
    • In vivo studies with high cholesterol-fed rabbits to examine quercetin metabolite accumulation in aortic tissue and their impact on lipid deposition.

    Main Results:

    • Catechol-type flavonoids exhibit strong antioxidant activity due to their B ring's o-dihydroxyl group.
    • Quercetin metabolites, including Q3GA, retain significant antioxidant capacity despite intestinal conjugation.
    • Q3GA effectively inhibited lipid hydroperoxide-induced oxidative stress in nerve cells.
    • Quercetin metabolites were found in the aortic tissue of rabbits and inhibited cholesteryl ester hydroperoxide deposition.
    • Quercetin metabolites are present in human atherosclerotic lesions, particularly within macrophage-derived foam cells.

    Conclusions:

    • Dietary flavonoids possess significant antioxidant properties beneficial for preventing atherosclerosis.
    • Specific metabolites like Q3GA retain potent antioxidant activity and can counteract oxidative stress in cellular models.
    • In vivo evidence supports the role of quercetin metabolites in inhibiting atherosclerotic processes, including lipid deposition.
    • Understanding the distribution and targets of flavonoid metabolites is crucial for assessing their in vivo efficacy against atherosclerosis.